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![HelloWorld]
This is the default introductory program to a new programming or scripting language.  The main purpose and goal of the program is to display the text string "Hello World\n" to the standard output stream ([stdout(3)]).

Some examples in different ProgrammingLanguages:

[BASIC]
 PRINT "Hello World\n"

[C]
 #include <stdio.h>
 int main(int argc, char **argv) {
   printf("Hello World\n");
   return 0;
 }

[C++]
 #include <iostream>
 void main(){
   std::cout << "Hello World" << endl;
 }

Linux x86 AssemblyLanguage
 .data
 .align 4
 message:
   .string    "Hello World\n"
 message_len = . - message

 .text
 .align 4
 .globl _start
 _start:
    movl $0x4, %eax
    movl $0x1, %ebx
    movl $message, %ecx
    movl $message_len, %edx
    int  $0x80
    movl $0x1, %eax
    xorl %ebx, %ebx
    int  $0x80

[Perl]:
 print join('', pack("V4", (0x6c6c6548,0x6f77206f,0xa646c72)));

[Python]:
 print "Hello World"

[UserRPL]:
 << "Hello World" MSGBOX >>

Well yeah, I could go on and on for different programming languages but there would be too many to list here[1].


----
Also see PolyGlot
----

Up there you see the problem with Hello World; most Hello Worlds look exactly like the Python one. It's not really meant as a sample program. What you learn from creating a Hello World program is how to use the language tools: it's a first exercise in entering, compiling and running a program on a paticular system, and it might make you go find the documentation on the I/O library in some cases. [99 Bottles of Beer on the Wall | http://99-bottles-of-beer.ls-la.net/] is slightly better for demonstrating the look of a language, [Ward Number |http://c2.com/cgi-bin/wiki?WardNumberInManyProgrammingLanguages] a lot better.

-- GlynWebster

----

__Footnotes__

[1] In fact there are hundreds of programming languages. [2]
[2] Thousands. (You haven't written your own yet? :-) [3]
[3] I'm on my third at the moment.. >:-)[4]
[4] Footnote or programming language?

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Version 10, saved on Saturday, January 25, 2003 12:05:43 am by "BartvanDeventer"

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